Ex-Nappy Roots rapper R. Prophet says he was the victim of a RACIST BEATDOWN … and tells TMZ he’s thinking about suing the hell out of the cops who tased him earlier this week.

Prophet called in to “TMZ Live” … and says he feels it was “definitely racial profiling” when cops in Kentucky approached a car he was riding in this weekend … and proceeded to beat the crap out of him.

The rapper says the driver of his car was arrested for DUI at a police checkpoint that night … and was taken to a nearby police station.

Prophet says he was left in the car … and while he was trying to figure out how to get home, an officer approached the parked vehicle and demanded the rapper step outside.

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“[The officer] said , ‘Step out of the car sir,’ … so I stepped out of the car. Next thing I know I was getting handcuffed … and the officer pulls out … his little electrocuting gun, they call it a taser or whatever.”

The rapper tells TMZ he was beaten mercilessly for no reason.

Prophet says he had been drinking that night … but insists he didn’t do anything wrong at any point in the evening.

Cops tell a different story … saying the rapper was highly intoxicated, walked directly into traffic and was a danger to himself and others.

Either way, Prophet says he plans to unleash a legal nightmare on the cops … right after he clears his name with the judge.